Would be on a 15 Chevy 2500 or on the back of a fifth wheel travel trailer and on the latter I would upgrade and brace the hitch as necessary. Looking at the rack n ride which is designed for adventure bikes and rated to 650lbs my bike weighs in at about 550lbs.
Hitch Motorcycle Rack Hitch Hauler Hitch Motorcycle Carrier
racknride.com
I have a Rack n Ride (Rack n Roll), and like
KYwoodsrider, I haul a CRF450L behind a Tacoma. The RnR is a solid option, and I wouldn't worry about it being the point of failure.
If you're going to reinforce the receiver mount, you might consider adding a second receiver to the vehicle and a second rack support to the carrier. Doing that would support the weight better, and virtually eliminate the twisting & rocking that's common to hitch carriers. I've seen motorhomes set up like this, with massive Harleys on the rack, going down the highway without any sway.
Before getting too excited about putting a carrier behind a 5th wheel TT, make sure there's a decent frame under it. Some RV trailers don't have much steel supporting them.
I'd also suggest getting a longer ramp, or trying to load & unload with the vehicle below the grade of the end of the ramp to decrease the angle. When I load my bike, I park in the street with the ramp resting above the curb. It's much easier to load doing it that way, as opposed to having the truck sitting higher than the ramp's end. My only complaint with the RnR is that it could benefit from a longer ramp.